Uncertainty in Primary Gas Flow Standards Due to Flow Work Phenomena
Uncertainty in Primary Gas Flow Standards Due to Flow Work Phenomena
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发表时间：
2000-06
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影响因子：
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通讯作者：
J. Wright;A. Johnson
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文献类型：
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作者：
J. Wright;A. Johnson
静态重量法和静态体积法气体流量标准都受到与存量体积内气体质量变化测量有关的不确定度分量的影响。在将气体转移到收集容器中的过程中，在库存体积中发生快速的压力和温度变化。一个低不确定度的气体流量标准需要对这些瞬变过程有透彻的了解，以便开发出合适的仪表、系统设计和操作程序。一个热力学模型的流动工作现象，并与实验测量和策略，以尽量减少其对流量的不确定性进行了讨论。用于应用在抛物线上，热电偶在3处，在热电偶的致动期间，时间常数与热电偶两端的时间常数之间的反向依赖关系与预期的基于时间常数A的响应时相比更准确，但低于
: Static gravimetric and static volumetric gas flow standards are both affected by uncertainty components related to the measurement of the change of mass of gas within the inventory volume. In the process of diverting gas into the collection vessel, rapid pressure and temperature changes occur in the inventory volume. A low uncertainty gas flow standard requires thorough understanding of these transients so that appropriate instrumentation, system design, and operating procedures may be developed. A thermodynamic model for the flow work phenomena is presented and compared to experimental measurements and strategies for minimizing their effects on flow uncertainty are discussed. used in apply on a parabolic with the thermocouple at at 3 during actuation of the thermocouple time constant between and inverse dependence of the time constant on the of across the thermocouple is as expected based time constant A when response but more accurate comparison to under